Pen and display device including the same

Abstract

A display device includes a display panel, an input sensing part disposed on the display panel, and a pen. The pen includes a ferrite core, a coil disposed on an outer perimeter surface of the ferrite core, a capacitor connected to the coil, and a cover conductor covering an outer portion of the coil.

What is claimed is: 
     
         1 . A display device, comprising:
 a display panel;   an input sensing part disposed on the display panel; and   a pen, comprising:
 a ferrite core; 
 a coil disposed on an outer perimeter surface of the ferrite core; 
 a circuit board connected to the coil; 
 a cover conductor disposed on an outside of the coil; and 
 a cover ferrite disposed between the cover conductor and the coil. 
   
     
     
         2 . The display device of  claim 1 , wherein in an extending direction of the ferrite core, a length of the coil, a length of the cover ferrite, and a length of the cover conductor are different from each other. 
     
     
         3 . The display device of  claim 2 , wherein in the extending direction of the ferrite core, the length of the cover ferrite is greater than the length of the cover conductor. 
     
     
         4 . The display device of  claim 2 , wherein in the extending direction of the ferrite core, the length of the coil is greater than the length of the cover ferrite. 
     
     
         5 . The display device of  claim 1 , wherein an area of the cover ferrite is greater than an area of the cover conductor. 
     
     
         6 . The display device of  claim 1 , wherein the cover ferrite has a closed-loop shape. 
     
     
         7 . The display device of  claim 1 , wherein the cover ferrite has an open-loop shape. 
     
     
         8 . The display device of  claim 1 , wherein an area of the cover conductor and an area of the cover ferrite are about equal. 
     
     
         9 . The display device of  claim 1 , wherein the cover conductor is one of a plurality of cover conductors. 
     
     
         10 . The display device of  claim 9 , wherein the cover ferrite is one of a plurality of cover ferrites. 
     
     
         11 . The display device of  claim 1 , wherein the cover conductor comprises a paramagnetic substance or a diamagnetic substance. 
     
     
         12 . The display device of  claim 1 , wherein the cover conductor is in a floating state. 
     
     
         13 . The display device of  claim 1 , wherein the cover conductor comprises a paramagnetic substance or a diamagnetic substance. 
     
     
         14 . The display device of  claim 1 , wherein the cover conductor has a closed-loop shape. 
     
     
         15 . The display device of  claim 1 , wherein the cover conductor covers at least half of the outer portion of the coil. 
     
     
         16 . The display device of  claim 1 , wherein the cover conductor covers an entirety of the outer portion of the coil. 
     
     
         17 . The display device of  claim 1 , wherein the cover conductor has an open-loop shape. 
     
     
         18 . A pen, comprising:
 a ferrite core;   a coil disposed on an outer perimeter surface of the ferrite core;   a circuit board connected to the coil;   a cover conductor disposed on an outside of the coil; and   a cover ferrite disposed between the cover conductor and the coil.   
     
     
         19 . The pen of claim  19 , wherein in an extending direction of the ferrite core, a length of the coil, a length of the cover ferrite, and a length of the cover conductor are different from each other. 
     
     
         20 . An electronic device, comprising:
 a display panel;   an input sensing part comprising:
 a first sensing electrode; 
 a second sensing electrode insulated from the first sensing electrode while crossing the first sensing electrode; 
 a first pen sensing electrode; and 
 a second pen sensing electrode insulated from the first pen sensing electrode while crossing the first pen sensing electrode; and 
 a pen, comprising: 
 a ferrite core; 
 a coil disposed on an outer perimeter surface of the ferrite core; 
 a circuit board connected to the coil; 
 a cover conductor disposed on an outside of the coil; and 
 a cover ferrite disposed between the cover conductor and the coil.